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DAC161S997RGHR Scheda tecnica(PDF) 9 Page - Texas Instruments

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Il numero della parte DAC161S997RGHR
Spiegazioni elettronici  16-bit SPI Programmable DAC for 4-20mA Loops
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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DAC161S997RGHR Scheda tecnica(HTML) 9 Page - Texas Instruments

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DAC161S997
www.ti.com
SNAS621 – JUNE 2013
REGISTER SET
Unless otherwise indicated, bits outside the register fields listed below are do not care, and will not change
device configuration. Register read operations on such do not care fields will be 0. Registers are read/write
unless indicated otherwise.
Table 1. XFER_REG (Write Only)
Address = 0x01
Bit Field
Field Name
Description
When PROTECT_REG_WR is set to 1, then a XFER_REG command is necessary to
15:0
XFER[15:0]
transfer the previous register write data into the appropriate address. Set this register
to 0x00FF to perform a XFER_REG command.
Table 2. NOP
Address = 0x02
Bit Field
Field Name
Description
No Operation. A write to this register will not change any device configuration.
15:0
NOP[15:0]
This command indicates that the SPI connection is functioning and is used to avoid
SPI_INACTIVE errors.
Table 3. WR_MODE
Address = 0x03; Default = 0x0000
Bit Field
Field Name
Description
0: Register write data transfers to appropriate address immediately after CSB goes
high. Default value.
0
PROTECT_REG_WR
1: Enable protected register transfers: all register writes require a subsequent
XFER_REG command to finalize the loading of register data. Refer to OPTIONAL
PROTECTED SPI WRITES
Table 4. DACCODE
Address = 0x04; Default = 0x2400, 0xE800
Bit Field
Field Name
Description
16-bit natural binary word, where D15 is the MSB, which indicates the desired DAC
output code.
15:0
DACCODE[15:0]
Note the default value of this register is based on the state of the ERR_LVL pin during
startup or reset.
Table 5. ERR_CONFIG
Address = 0x05; Default = 0x0102
Bit Field
Field Name
Description
L_RETRY_TIME sets the time interval between successive attempts to reassert the
desired DACCODE output current when a loop error is present. This has no effect if
either MASK_LOOP_ERR is set to 1 or if DIS_RETRY_LOOP is set to 1.
10:8
L_RETRY_TIME[2:0]
LOOP Retry time = (L_RETRY_TIME + 1) × 50 ms
Default value = 1 (100 ms)
0: When a loop error is occurring, periodically attempt to send desired DACCODE
output current instead of the set ERR_LOW current. The interval between attempts is
set by L_RETRY_TIMER. Default value.
7
DIS_RETRY_LOOP
1: Do not periodically reassert DACCODE output when a loop error is present;
reassert DACCODE after STATUS Register is read out.
0: When a LOOP error is detected the DAC161S997 outputs the current indicated by
ERR_LOW instead of DACCCODE. Default value.
6
MASK_LOOP_ERR
1: When a Loop Error is detected the DAC161S997 tries to maintain DACCODE
current on pin OUT.
Copyright © 2013, Texas Instruments Incorporated
9
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